A waterfall, unlike a lake needs more than just a freezing temperature to freeze.
“The physics behind the freezing can be a little bit more complicated,” according to National Weather Service Meteorologist Paige Marten. “It depends on the weather, the temperature, the rate of flow from the river that’s feeding into the waterfall.”
Marten stated to WCCO, that water will supercool if temperatures drop below freezing for a long time. It is liquid even though it is colder than 32 degrees. Frazil ice forms when it reaches that temperature.
The frazil-ice forms on rocks and cliffs surrounding the waterfall. These ice masses then become more ice.
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